The apostle John once entered a bath to bathe; but, learning that Cerinthus was within (he was a heretic notable for a theology which said Christ’s kingdom was an earthly kingdom,which lead to the indulgence of many wicked fleshly desires, -ed), he sprang from the place and rushed out of the door, for he could not bear to remain under the same door with him. And he advised those that were with him to do the same, saying, “Let us flee, lest the bath fall; for Cerinthus, the enemy of the truth, is within.”

-as relayed by Eusebius, ch 28, paragraph 6